有没有其他限制，比如lei一定要相连，或可以分开？ lei相连的单词如下：

acrolein aculei buddleia cleidoic cleistogamic cleistogamies

cleistogamous cleistogamy deleing fleishig fraulein gallein

gleization ileitides ileitis kaleidoscope kaleidoscopic

landsleit leis leishmania leister leisure leisureliness

leisures leisurewear leitmotif leitmotiv macronuclei

madeleine mallei marbleise marbleize micronuclei

mullein necropoleis nuclei nuclein oleic olein oleine

phenolphthalein pilei pleiad pleinairism pleinairist

pleiotropic poleis pronuclei sleigh solei spiegeleisen

terreplein tholeiite velleity villein